伽师-巴楚地区中强地震加速度衰减关系研究   总被引：2，自引：0，他引：2       下载免费PDF全文

唐丽华  李锰  王海涛 《地震工程学报》2007,29(4):377-379,384

采用直接估计经验方法对巴楚-伽师地区1996-2003年126条M≥4地震的加速度记录进行回归分析,得到中强地震在土层场地上的水平向和垂直向加速度衰减规律。其中水平向加速度衰减关系适用的震级范围为4.0≤M≤6.9,垂直向为4.0≤M≤5.9。  相似文献   

Influence of parameters selection in Chebyshev filters on the strong motion data processing     

Guergana Mollova  Frank Scherbaum 《Bulletin of Earthquake Engineering》2007,5(4):609-627

This contribution discusses the application of Chebyshev Type I filter for processing real earthquake records. Consideration is given to the effects of filtering parameters (passband amplitude ripple and order of the filter) on the time series, strong-motion parameters, Fourier Amplitude Spectrum of acceleration, and elastic displacement response spectra. Time histories of five earthquakes with different moment magnitudes have been examined (from stations located close to the epicenters). Data processing is based on application of bandpass Chebyshev filtering over frequency range with substantial signal to noise ratio (level of 3 or approximately 3 dB). Applying different filters, we have monitored several important strong-motion parameters: peak values of acceleration, velocity, and displacement; Arias intensity, acceleration/velocity spectrum intensity, significant duration, etc. Some new results and conclusions concerning the influence of Chebyshev filter in data processing of records have been summarized. The graphical and numerical outcomes obtained, as well as the comparison with a Butterworth causal filter, are included in the work. The results could be potentially useful to engineering seismologists who need to evaluate and better understand the merits of this type of filtering for strong-motion data processing.  相似文献   

风力发电机地基的现场加速度测试和数值模拟   总被引：1，自引：0，他引：1  

周健  金炜枫  金卫华  孔戈 《地震工程学报》2011,33(Z1)

对某风电场风力发电机地基进行现场加速度测试,在土动力性能室内试验的基础上利用有限元对风机基础—地基系统进行数值模拟。在地基加速度的峰值、衰减规律和频率上,现场测试与计算结果吻合较好,验证了动力数值分析模型及相关参数取值的合理性,为建立风机振动对周围环境影响的数值模型提供了依据。  相似文献   

乌恰5.1级地震强震动加速度记录初步分析     

张振斌  史勇军  孔祥燕 《内陆地震》2011,25(1):52-57

对新疆数字强震台网记录的2010年06月10日乌恰Ms5.1地震10组三分量加速度记录进行处理和初步分析.在分析前对原始加速度记录进行整理,转换数据格式,进行零线校正,计算校正加速度、速度、位移时程谱、傅立叶振幅谱、加速度反应谱.在对本次地震的强震动特性进行分析后发现,较大的加速度峰值沿发震断层分布,集中在靠近断层的狭...  相似文献   

我国三峡库区近49年暴雨气候特征分析   总被引：2，自引：0，他引：2  

郭渠  龙中亚  程炳岩  孙卫国  李瑞 《水文》2011,31(6):86-91

根据三峡库区及其周围35个气象站1961～2009年的逐日降雨资料,采用常规统计方法、小波变换等方法,分析了49年来三峡库区暴雨日数的气候变化特征;使用偏态系数与峰度系数方法,对暴雨日数分布的正态性进行了分析。结果表明:49年来,三峡库区的暴雨事件具有显著的年代际变化和区域差异,年平均暴雨日数及其均方差空间分布型态比较一致。历年暴雨日数的偏态系数以正偏为主,峰度系数则以负值为主。  相似文献   

Experimental simulation of shoreface nourishments under storm events: A morphological,hydrodynamic, and sediment grain size analysis     

F. Grasso  H. MichalletE. Barthélemy 《Coastal Engineering》2011

This study focuses on barred beach shoreface nourishments physically simulated in a wave flume. The attack of a schematic storm on three different nourishments is analysed. The apex and waning storm phases lead respectively to offshore and onshore sediment transports. Nourishments in the trough and on the outer bar feed the bar and increase wave dissipation offshore. The bar acts as a wave filter and reduces shore erosion (lee effect). In contrast, nourishment on the beach face leads mostly to shore feeding and reconstruction (feeder effect). With successive nourishments, the beach face clearly becomes steeper and onshore sediment transport is reduced during moderate wave climates. The surface grain size analysis reveals marked variations. Coarser sediments are sorted on the bar and the upper beach face. These locations correspond to large wave dissipation zones during the storm apex.  相似文献   

1998年9月23 日复杂太阳爆发射电联合观测的初步分析   总被引：1，自引：1，他引：0  

谢瑞祥  汪敏  颜毅华  段长春 《天文学报》2002,43(2):145-154

利用北京天文台1998.09.23日1-2GHz和2.6-3.8GHz频谱仪观测到的一个Ⅲ-Ⅳ型复杂大爆发，结合俄罗斯SSRT和德国分米-米波动态频谱仪的观测资料，进行了初步的比对分析，拓展了关于日冕电子加速和日冕磁结构方面的一些研究内容，简单地注释了一些可研究的现象和运动Ⅳ型爆发及多重脉动的辐射机制。  相似文献   

Particle acceleration and nonthermal radiation in space plasmas     

D. B. Melrose 《Astrophysics and Space Science》1996,242(1-2):209-246

Acceleration processes for fast particles in astrophysical and space plasmas are reviewed with emphasis on stochastic acceleration by MHD turbulence and on acceleration by shock waves. Radiation processes in astrophysical and space plasmas are reviewed with emphasis on plasma emission from the solar corona and electron cyclotron maser emission from planets and stars.  相似文献   

A semi-analytical approach to non-linear shock acceleration     

Pasquale Blasi 《Astroparticle Physics》2002,16(4):2333-439

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STATISTICAL PROPERTIES OF HIGH-FREQUENCY INTERNAL WAVES IN QINGDAO OFFSHORE AREA OF THE YELLOW SEA   总被引：1，自引：0，他引：1  

王涛  高天赋 《中国海洋湖沼学报》2002,20(1):16-21

Densely-sampled thermistor chain data obtained from a shallow-water acoustics experiment in the Yellow Sea off the coast of Qingdao were analyzed to examine the statistical properties of the 6 to 520 cpd frequency band internal waves observed. The negative skewness coefficients and the greaterthan-3 kurtosis coefficients indicated non-Gaussianity of the internal waves. The probability distributions were negatively skewed and abnormally high peaks. Nonlinear properties, as exemplified by the asymmetric waveshapes of the internal waves in the offshore area are described quantitatively.  相似文献